Abstract
Extended X-ray Absorption Fine Structure (EXAFS) spectroscopic data for Cd2+ sorbed on goethite in the presence of phosphate, sulphate and humate indicate that cadmium is surrounded by a first shell of ∼6 ± 1 O atoms at 2.3 ± 0.1 Å. A second shell of approximately 2 Fe atoms at 3.8 ± 0.1 Å is also observed. These interatomic distances suggest that Cd2+ is inner-spherically bound by bidentate double-corner-sharing adsorption on the (110) surface of goethite. In contrast, Cd2+ appears to form a precipitate in the presence of citrate and oxalate. The enhancement of Cd2+ adsorption in the presence of sulphate and phosphate is solely by electrostatic interaction, implying that the ligands sorb to sites other than those occupied by Cd2+. No ternary complexes are observed in the presence of these 2 inorganic ligands.
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